Vertical transmission of viruses.
D000818:Animals; D001179:Arthropod Vectors; D001181:Arthropods / Q000382:microbiology; D005260:Female; D005315:Fetal Diseases / Q000635:transmission / Q000662:veterinary; D006801:Humans; D008297:Male; D008322:Mammals; D010063:Ovum / Q000382:microbiology; D011247:Pregnancy; D011251:Pregnancy Complications, Infectious / Q000635:transmission / Q000662:veterinary; D012639:Seeds / Q000382:microbiology; D013094:Spermatozoa / Q000382:microbiology; D014777:Virus Diseases / Q000635:transmission* / Q000662:veterinary; D014779:Virus Replication; D014780:Viruses / Q000254:growth & development